mcb: Fix error handling in mcb_alloc_bus() - Kernel
Summary
GSD-2021-1001574: mcb: fix error handling in mcb_alloc_bus(). Affects Kernel versions >= 5d9e2ab9fea4cdf0a2522f5cbed2e7fbb220d757, < 66f74ba9be9daf9c47fface6af3677f602774f6b. No fix is published. How to fix ↓
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Background
The Kernel is the core component of the Linux operating system. It provides essential services and functions to enable communication between hardware and software. The mcb_alloc_bus() function is responsible for allocating resources for a specific bus in the MCB (Multichannel Buffered Serial) subsystem. This subsystem is used for communication with external devices via serial interfaces. The vulnerability in mcb_alloc_bus() could lead to error conditions not being properly handled, potentially resulting in system instability or crashes.
Vulnerability Detail
The vulnerability in mcb_alloc_bus() was introduced in version v4.7 of the Linux Kernel by commit 5d9e2ab9fea4cdf0a2522f5cbed2e7fbb220d757. It was fixed in version v4.19.209 by commit 66f74ba9be9daf9c47fface6af3677f602774f6b. The issue arises from improper error handling, which can lead to unexpected behavior or system crashes. Attackers may be able to exploit this vulnerability to cause denial-of-service attacks or gain elevated privileges.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No workaround has been provided for this vulnerability.
Conclusion
The vulnerability in mcb_alloc_bus() in the Kernel can lead to system instability, crashes, or potential privilege escalation. It is recommended to update the Linux Kernel to version v4.19.209 or later to mitigate this vulnerability. Users can also utilize the Vulert Playground to check if their system is affected by this vulnerability. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability in mcb_alloc_bus() can lead to system instability, crashes, or potential privilege escalation.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it for any known vulnerabilities.
At the time of this report, no known exploits for this vulnerability have been disclosed.
The vulnerability itself does not provide remote code execution capabilities. However, if an attacker gains access to the system, they may be able to exploit this vulnerability to escalate privileges or cause denial-of-service attacks.
For more details about this vulnerability, including technical specifics and the fix implementation, please refer to the source link provided in the database_specific section of this report.
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